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Hi
Please find below a fairly comprehensive guide to using envelopes on your machine
The address is automatically rotated and printed according to the envelope's direction by specifying with the printer driver properly. You can only print on envelopes with the computer. Do not use the following envelopes. They could jam in the machine or cause the machine to malfunction.
- Envelopes with an embossed or treated surface
- Envelopes with a double flap
- Envelopes whose gummed flaps are already moistened and adhesive
Prepare envelopes. Press down on all four corners and edges of the envelopes to flatten them. If the envelopes are curled, hold the opposite corners and gently twist them in the opposite direction. If the corner of the envelope flap is folded, flatten it. Use a pen to press the leading edge in the inserting direction flat and sharpen the crease. The envelopes may jam in the machine if they are not flat or the edges are not aligned. Make sure that no curl or puff exceeds 0.1 inches (3 mm).
Load envelopes.(1) Open the front cover gently, and extend the paper support.(2) Use the right paper guide (A) to slide both paper guides all the way out.(3) Load the envelopes in the center of the front tray WITH THE ADDRESS SIDE FACING DOWN.
The folded flap of the envelope will be faced up on the left side.
Push the envelopes all the way to the back of the front tray.
Up to 5 envelopes can be loaded at once.(4) Slide the right paper guide (A) to align the paper guides with both sides of the envelopes.
Do not slide the paper guides too hard against the envelopes. The envelopes may not be fed properly.
Do not overload envelopes by stacking until the top of the stack touches the paper guides.
(5) Open the output tray extension.
Open the paper output tray.and extend the paper output support. Be sure to open the paper output tray when printing. If not open, the machine cannot start printing.
After loading envelopes Select the size and type of the loaded envelopes on the print settings screen of the printer driver.
You may find it easier to download the manual from hereCanon PIXMA MG3250
and install it on your desktop for future reference
Cheers

Solution : Print on Envelopes
You can print envelopes from the Bypass Tray only.Guidelines for Printing Envelopes

Print quality depends on the quality and construction of the envelopes. Try another envelope brand if you do not get desired results.

Maintain constant temperatures and relative humidity.

Store unused envelopes in their packaging to avoid excess moisture and dryness which can affect print quality and cause wrinkling. Excessive moisture can cause the envelopes to seal before or during printing.

Remove air bubbles from the envelopes before loading them into the tray by setting a heavy book on top of them.

In the print driver software, select Envelope as the paper type.

Do not use padded envelopes. Use envelopes that lie flat on a surface.

Do not use envelopes with heat activated glue.

Do not use envelopes with press and seal flaps.

Use only paper envelopes.

Do not use envelopes with windows or metal clasps.

To Load Envelopes in the Bypass Tray:

Open the Bypass Tray.

Move the width guides to the edges of the tray.

NOTE: If you do not load envelopes in the Bypass Tray right after they have been removed from the packaging, they can bulge. Flatten them to avoid jams.

To load envelopes, select an option:

For Number 10 envelopes, load the envelopes with the short edge going into the printer, flaps down, and flaps to the right.

For C5 envelopes, do one of the following. If the envelopes wrinkle, try another option.

Insert envelopes with the print side up, flaps closed and down, and flaps going into the printer.

Insert envelopes with the print side up, flaps closed and down, and flaps going into the printer.

Envelopes in the HP 4250 are loaded in tray 1 -- the pull-out tray on the front of the printer. Set the envelopes in and adjust the side guides, then go into the menu and set the correct paper size and type for tray 1.

You can load up to 10 envelopes in the standard tray. Try a sample of any envelopes you are
considering using with the printer before buying large quantities. See Loading envelopes in the
standard tray for instructions on loading envelopes.
When printing on envelopes:
• To achieve the best possible print quality, use only high-quality envelopes that are designed
for use in laser printers.
• Set the Paper Source in the Paper Menu based on the source you are using, set the Paper
Type to Envelope, and select the correct envelope size from the operator panel, the printer
driver, or from MarkVision Professional.
• For best performance, use envelopes made from 90 g/m2 (24 lb bond) paper. You can use up
to 105 g/m2 (28 lb bond) weight for the 250-sheet standard tray or 105 g/m2 (28 lb bond)
weight for envelopes as long as the cotton content is 25% or less. Envelopes with 100%
cotton content must not exceed 90 g/m2 (24 lb bond) weight.
• Use only new, undamaged envelopes.
• For best performance and to minimize jams, do not use envelopes that:
– Have excessive curl or twist.
– Are stuck together or damaged in any way.
– Contain windows, holes, perforations, cutouts or embossing.
– Use metal clasps, string ties, or metal folding bars.
– Have an interlocking design
– Have postage stamps attached
– Have any exposed adhesive when the flap is in the sealed or closed position
– Have nicked edges or bent corners
– Have rough, cockle, or laid finishes
• Use envelopes that can withstand temperatures of 170°C (338°F) without sealing, excessive
curling, wrinkling, or releasing hazardous emissions. If you have any doubts about the
envelopes you are considering using, check with the envelope supplier.
• Adjust the width guide to fit the width of the envelopes.
• Load only one size of envelope at a time in the tray. Envelopes may only be loaded in the
standard tray. Load them with the flap down and the flap to the left of the tray.
• A combination of high humidity (over 60%) and the high printing temperatures may seal the
envelopes.

Loading envelopes in the standard tray
The recommended stack height is 10 envelopes; however, in normal environments as many as 15
envelopes may be loaded. In high temperature or humidity environments, only seven envelopes
should be loaded.
1 Pull the standard tray completely out.
2 Squeeze the length guide tabs together as shown in step 2 on page 42. Slide the guide to
the correct position for the size of envelope you are loading.
3 Squeeze the width guide tabs as shown in step 3 on page 42. Slide the width guide to the
correct position for the size of envelope you are loading. Notice the size indicators on the
bottom left of the tray.
4 Push the envelope stack aid tabs toward each other. They snap into place.
5 Flex a stack of envelopes back and forth and then straighten the edges on a level surface.
Press down the corners to flatten them.
Fan the envelopes. This prevents the edges of the envelopes from sticking together and helps
them feed properly.6 Load envelopes flap side down with the stamp area and flap on the right. The end of the envelope with the stamp area enters the printer first.
7 Insert the standard tray.

nstructions
Use the following steps to ensure that you are ready to print envelopes.
Your printer can have either a single envelope or multiple envelopes loaded and ready for printing.

If
you are printing a single envelope, you can use the single envelope
slot and leave your paper in the lower (IN) tray. This allows you to
print the envelope and then a letter.

If you are printing a stack of envelopes, use the lower (IN) tray for loading the stack of envelopes.

To Load a Single Envelope

Do not remove the paper from the lower (IN) tray. Be sure the card
guide is in the down position, before using the single envelope slot.

Remove a single envelope from its packaging.

Slide the envelope evenly into the single envelope slot. The single
envelope slot is located on the right side of the upper (OUT) tray. The
envelope should be loaded with the address side down (flap side up).

Make sure the creased flap edge of the envelope aligns with the right side of the single envelope slot.

Slide the envelope through the slot until it stops. Make sure the envelope is not bent and is straight in the envelope slot.
NOTE:
To minimize print skew, use envelopes with rectangular flaps rather than triangular flaps.

To Load Multiple Envelopes

Slide the paper width adjuster to its leftmost position.

Pull out the paper length adjuster and remove any paper from the IN tray.

Remove up to 20 envelopes from their packing and tap the short edge of the envelopes on a flat surface to even the stack.

Slide the envelopes evenly into the IN tray, address side down (flap side up).

Slide the paper width adjuster to the right until it gently touches the left edge of the envelope stack.

For size Invitation A2 and C6 Envelopes, press the inside of the paper length adjuster handle to release and lower it.

For all sizes of envelopes, push the paper length adjuster in toward
the envelopes until it stops. Make sure the envelopes are flat in the
lower tray and not bent.

Set up the Printer Properties

Select Start on the taskbar. Choose Settings, then Printers. Right-click the printer. Select Properties from the pop-up menu.

Select the Paper or Setup tab depending on the version of the printer driver software.

In the Paper Options section, select the desired envelope size from the Paper Size drop-down box.

Click OK.

Print
Print the envelope from your chosen program. From most applications, just select the File menu, then choose Print.
After Printing the Envelopes
Reset the printer and the printer properties for the kind of printing you will be doing next.

Remove any remaining envelopes from the lower (IN) tray.

Slide the paper width adjuster to its leftmost position.

Load the desired paper into the lower (IN) tray.

On the computer, Select Start on the taskbar. Choose Settings, then
Printers. Right-click the printer. Select Properties from the pop-up
menu.

Select the Paper or Setup tab depending on the version of the printer driver software.

In the Paper Options section, select the desired paper size from the Paper Size drop-down box.

Here is a how-to for the printer, but I'm not sure if you mean the printer, or in a program.If this is not what you need, let me know.

HP Deskjet 920c and 940c Series Printers -
Printing Envelopes

Loading a single envelope
Loading multiple envelopes
Loading a single envelope
Preparing to print

Place the envelope, with the flap side on the left and facing up, into the single envelope slot.

Push the envelope forward until it stops. See Figure 1.

Figure 1: Inserting the envelopePrinting guidelines

Verify that the Out tray is in the down position.

Avoid using envelopes that have clasps or windows.

Avoid
using envelopes that are shiny or embossed, envelopes with thick,
irregular, or curled edges, or envelopes that are wrinkled, torn, or
otherwise damaged.

Loading multiple envelopes
Preparing to print

Pull out the In tray.

Slide out both paper guides and remove all paper from the tray.

Place no more than 15 envelopes -- with the flap side on the left and facing up -- in the tray.

Push the envelopes forward until they stop.

Slide the paper guides snugly against the edges of the envelopes, then push the tray forward until it stops. See Figure 2.

Figure 2: Inserting multiple envelopesPrinting the envelopes
Each
software program is different and requires different steps to
successfully print envelopes. For instance, in many versions of MS
Word, clicking Tools
, and then
Envelopes and Labels
, accesses the envelope-printing feature. Other software programs will
differ from this procedure. Consult the Help menu on a software program
or User's Guide
for instructions for the particular application.
Printing guidelines

Never place more than 15 envelopes in the In tray at one time.

Align the envelope edges before inserting them.

Avoid using envelopes that have clasps or windows.

Avoid
using envelopes that are shiny or embossed, envelopes with thick,
irregular, or curled edges, or envelopes that are wrinkled, torn, or
otherwise damaged.